Brassica abuse

I'm a total newbie, so be gentle... I can find answers to good questions on this forum or googling, so the ones I'm going to post are likely to be the stupid ones...
I have started some brassicas indoors (calabrese, tendergreen broccoli, some cabbage). I threw away almost all the first batch since they were too leggy. After reading the relevant posts here, the second batch was less mollycoddled, and it was kicked out of the (unheated) propagator and put under a large skylight as soon as the plants were visible (DD, before you say something, I'm using the tinfoil method, which got some derogatory "wife having a blue peter moment" comments from the hubby).
Now I have a second batch going, but they seem to be growing very, very  slowly. I know this depends on temperature/conditions/sunlight, but on average after how many weeks should the plants get 1/2/3 sets of real leaves? I also wonder if my putting them out a few days ago in the nice afternoon sun, and finding them "fainted" in totally dry soil a few hours later, might have stunted their growth. They recovered as soon as watered, buy hey who knows the scars that trauma can leave in a brassica's psyche... I read somewhere that plants that have experienced that might not be very productive. Should I cull this batch too and restart? I feel a bit like Herod at the moment...
Maybe I'm being paranoid, but seeing the big healthy calabrese plants at the garden centre yesterday made me wonder if my babies might be some big time underachievers...

I put the brassicas tray with lid on straight outside three weeks ago. (after my cabbages gone leggie indoors). No mollycoddle whatso ever. and have opened the lid and have put them in fleece frame. Bad thing is I've put broc, cabbage and cauli in a single tray and forgot to name them. They will certainly give me a surprise if any produce a heart.
Right
in three division one has green coty leaves and other is deep purple in sprout. hard to notice them with compost colour. the third division is silent up until now.

me to snoop,epecially with empty washing up bottles&double sided sticky tape!!

So these plants won't become unproductive because I let them wilt for a brief time, as I read somewhere? I think I can hear a big sigh of relief from them, after having their neck in line for the chop...

Kristen, my brassicas have asked me to thank you for saving their lives.
I'm relieved...